Runners check-in during the Marathon Expo at the George R. Brown Convention Center in preparation for the Chevron Houston Marathon and Aramco Houston Half Marathon this weekend on Friday, Jan. 17, 2014, in Houston. less

Runners check-in during the Marathon Expo at the George R. Brown Convention Center in preparation for the Chevron Houston Marathon and Aramco Houston Half Marathon this weekend on Friday, Jan. 17, 2014, in ... more

Photo: Mayra Beltran, Houston Chronicle

Runners check-in during the Marathon Expo at the George R. Brown... Photo-5739929.77966 - Beaumont Enterprise

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Alyssa Nichols, 9, joins her mother Michelle Nichols, 32, to grab signs in support of her father who is running the Chevron Marathon. Michelle who will be running 5K this weekend.

Alyssa Nichols, 9, joins her mother Michelle Nichols, 32, to grab signs in support of her father who is running the Chevron Marathon. Michelle who will be running 5K this weekend.

Twin sisters Sue Jarvis and Kay Stewart shop for shoes during the Marathon Expo at the George R. Brown Convention Center on Friday, Jan. 17, 2014, in Houston. The sister will run the marathon together.

Twin sisters Sue Jarvis and Kay Stewart shop for shoes during the Marathon Expo at the George R. Brown Convention Center on Friday, Jan. 17, 2014, in Houston. The sister will run the marathon together.